Pywikibot allows transliteration of text before writing to files/ttys.
pywikibot/userinterfaces/transliteration.py - 108K
If any of the above are *functional* sufficient for pywikibot needs, we should use it. If there are minor gaps in support for languages, where pywikibot has better transliteration tables, we can push our improvements into the external package.
Otherwise, we start a new project with the pywikibot code so others can reuse and help develop/maintain the code.